rafaelcaricio/lvgl-rs
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Fix allocation

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This commit is contained in:
Rafael Caricio 2020-06-12 12:39:50 +02:00
parent 0c2e7659bd
commit 8072d2a09d
1 changed files with 15 additions and 19 deletions
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34
lvgl/src/display.rs
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@ -1,6 +1,7 @@
use crate::Color;
use alloc::boxed::Box;
use core::mem::MaybeUninit;
use core::ptr;
use embedded_graphics::prelude::*;
use embedded_graphics::{drawable, DrawTarget};
@ -16,32 +17,26 @@ impl DisplayDriver {
C: PixelColor + From<Color>,
{
let disp_drv = unsafe {
// Create a display buffer for LittlevGL
let mut display_buffer = MaybeUninit::<lvgl_sys::lv_disp_buf_t>::uninit();
// Declare a buffer for the refresh rate
// TODO: Make this an external configuration
const REFRESH_BUFFER_LEN: usize = 2;
let refresh_buffer1 = Box::new(
MaybeUninit::<
[MaybeUninit<lvgl_sys::lv_color_t>;
lvgl_sys::LV_HOR_RES_MAX as usize * REFRESH_BUFFER_LEN],
>::uninit()
.assume_init(),
);
let refresh_buffer2 = Box::new(
MaybeUninit::<
[MaybeUninit<lvgl_sys::lv_color_t>;
lvgl_sys::LV_HOR_RES_MAX as usize * REFRESH_BUFFER_LEN],
>::uninit()
.assume_init(),
);
let refresh_buffer1 = vec![
Color::from_rgb((0, 0, 0)).raw;
lvgl_sys::LV_HOR_RES_MAX as usize * REFRESH_BUFFER_LEN
];
let refresh_buffer2 = vec![
Color::from_rgb((0, 0, 0)).raw;
lvgl_sys::LV_HOR_RES_MAX as usize * REFRESH_BUFFER_LEN
];
// Create a display buffer for LittlevGL
let mut display_buffer = MaybeUninit::<lvgl_sys::lv_disp_buf_t>::uninit();
// Initialize the display buffer
lvgl_sys::lv_disp_buf_init(
display_buffer.as_mut_ptr(),
Box::into_raw(refresh_buffer1) as *mut cty::c_void,
Box::into_raw(refresh_buffer2) as *mut cty::c_void,
Box::into_raw(refresh_buffer1.into_boxed_slice()) as *mut cty::c_void,
Box::into_raw(refresh_buffer2.into_boxed_slice()) as *mut cty::c_void,
lvgl_sys::LV_HOR_RES_MAX * REFRESH_BUFFER_LEN as u32,
);
let display_buffer = Box::new(display_buffer.assume_init());
@ -55,6 +50,7 @@ impl DisplayDriver {
// Set your driver function
disp_drv.flush_cb = Some(display_callback_wrapper::<T, C>);
// TODO: DrawHandler type here
// Safety: `user_data` is set to NULL in C code.
disp_drv.user_data = device as *mut _ as *mut cty::c_void;
disp_drv
};